Date of Award

5-2024

Document Type

Access Controlled Thesis

Degree Name

Master of Science (MS)

Department

Kinesiology

First Advisor

Bryanne Bellovary, PhD, NSCA-CPT,*D, CSCS,*D

Second Advisor

Kevin Dames, Ph.D.

Third Advisor

Peter McGinnis, Ph.D.

Abstract

PURPOSE: The purpose of this study was to determine the intra-set reliability of the MetricVBT (MVBT) application using the hexagonal barbell deadlift and to determine the accuracy of the MVBT application compared to the LPT, Tendo Sport unit. METHODS: Thirty resistance trained individuals (24 males, 6 females; age: 21.7 ±1.6 years; height: 1.74±.08; weight: 86.4±18.9; body fat: 17.9±7.08) each completed a single testing session consisting of four sets of five repetitions of a hexagonal barbell deadlift, at 50%, 75%, 100%, and 125% of the participants’ body weight (BW). Velocity and displacement were recorded simultaneously by a Tendo Sport unit and two smartphones utilizing the MVBT application, one at 0° (MVBT0) and another at 30° (MVBT30) anterior offset. Device validity was assessed by repeated measures ANOVA with a Bonferroni post-hoc test. Intra-set reliability was assessed by interclass correlation coefficients (ICC) and Bland-Altman plots. RESULTS: Differences between devices were detected for both velocity (p < 0.001) and displacement (p < 0.001). Post hoc comparisons revealed that velocity and displacement were under-reported by MVBT0 and MVBT30. This was supported by Bland-Altman plots. Intra-set ICC demonstrated moderate to excellent reliability for MVBT0 and MVBT30 for velocity (ICC = 0.66 – 0.92) and displacement (ICC = 0.71 – 0.93) CONCLUSIONS: This study suggested the MVBT application was reliable, but under-reports velocity and displacement when compared to a Tendo Sport unit. Even though this smartphone applications may provide a cheaper and more accessible option for VBT, other applications should be considered for a more accurate outcome.

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